It would be useful to have the option to Enable/Disable a Firewall rule, or any rule within the Port-forward/NAT for that matter. Perhaps it could be placed next to the Remove icon on the overview, or as a toggle switch within the rule card.
Currently, workaround on my Android device, on the web app, to Disable/Enable a rule is to export the list of rules to file, remove a rule and then import it again. Or, one could change the content of source/destination and then change it back.